The two men share an impossible date... Jeremiah J. Pearson apparently died on 31 Feb 1842 (see the picture at http://cordova.lib.il.us/pearson_jeremiah.jpg) and, according to the transcription of Old Burnet Cemetery in Burnet, TX, John Alfred Ross was born on 31 Feb 1842. (See http://www.interment.net/data/us/tx/burnet/oldburnet/oldburnet.htm). The transcription was done in 2002.

Just googling the date "31 Feb 1842" yields 6 hits, so I tried a few other years. There are some pages which contain a February 31 date for every year I tried, including 2007. For dates since the 1960s, you get a lot of hits, most of which aren't actual dates, though there are always a few.